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Highlighting Feature for Typewriters

Publishing Venue

IBM

Related People

Schaefer, JO: AUTHOR

Abstract

With today's high quality correctable typewriters, the ability to make words stand out is generally limited to underscoring or, in the case of changeable font machines, the interchanging of different type styles. Additionally, some fabric machines offer bi-colored ribbons where accent can be accomplished by using an alternate color.

Country

United States

Language

English (United States)

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Highlighting Feature for Typewriters

With today's high quality correctable typewriters, the ability to make words
stand out is generally limited to underscoring or, in the case of changeable font
machines, the interchanging of different type styles. Additionally, some fabric
machines offer bi-colored ribbons where accent can be accomplished by using
an alternate color.

The bi-colored ribbon approach is generally considered a very effective way
to accent words. However, the high quality machines using film ribbon systems
with correction capability generally can not use this approach without incurring
cost and complexity trade-offs that are hard to cost-justify.

A good alternative to the two-color technique is to double-print accented
characters, using a slight horizontal displacement between the two.

The mechanism for providing this feature is fairly simple and also provides
automatic double-erase. The embodiment shown is only one of many forms
such a device can take and was chosen for its relative simplicity for modeling.

The control device for operating the typewriter to effect the highlighting
feature is illustrated in Fig. 1. Pawl member 10 may be depressed by a keylever
or other keyboard control member in the direction of the arrow in Fig. 1, thus
rotating pawl 10 about locating pin 12. As pawl 10 is depressed, pawl surface 14
is moved into engagement with the ratchet teeth of ratchet 16. Ratchet 16 is
combined with the six sided cam member 18 which rotates with ratchet 16. The
pawl member 10 may be moved rightward as a result of cyclical cam 20 and cam
follower/link 22. Cam 20 is attached to one of the cyclical rotating shafts of the
typewriter such that it rotates once for each print cycle.

Upon the actuation of pawl member 10 to present pawl surface 14 to ratchet
16, and the initiation of a printing cycle, cam 20 will rotate pulling follower/link 22
and pawl member 10 rightward, thus rotating ratchet 16 by an amount equal to
one tooth and will cause the six-sided cam member 18 to rotate, thus forcing
follower arm 24 to rise. As follower arm 24 rises, restore spring 26 is tensioned
and cables 28, 30, 32 and 34 are pulled. Cable 28 is attached to backspace
pawl 36 (Fig. 2) to cause a backward rotation of backspace ratchet 38 by a
predetermined amount, typically that which is sufficient to displace the print point
by approximately .018 of an inch. Cable 30 is extended to a connection with the
cycle clutch bail such that the cycle clutch for the typewriter is prevented from
resetting and thus is held withdrawn from the cycle clutch, causing a second
machine cycle.

Cable 32 is connected to a device, such as found in Fig. 3, for preventing
selection interposers from restoring and thereby insuring that the selection...